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PostPosted: Fri May 19, 2017 11:38 am 
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Joined: Mon Oct 28, 2013 9:09 pm
Posts: 17
Location: Leicestershire
Car Model: 1981 Saab 99 Turbo (2dr)
Sorry for the rather tedious question..

I'm finishing off a few bits on the 99T in preparation for it's MOT (first in a long time) next week which involves the joy of mending crispy connections / corroded wires etc. on the front sidelight / indicator units. The side lights use twin filament bulbs (P21/5W), there are two wires going to each bulb which can be connected either way round. I wanted to check that I have them back on right and they are doing what they are supposed to do. So...

With ignition on / headlamp switch off - both filaments are operational
With ignition on / headlamp switch in first position (parking lights?) low power filament is operational only
With ignition on / headlamp switch in second position low power filament is operational only (and headlights)
With ignition off low power filaments operate with switch in first position

Anybody know if this is correct?

For info I am using a C900 headlamp relay (the big red one) and I had to swap two of the connections (56a and b from memory) to make the dim / dip work the right way round.

Ta.


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PostPosted: Fri May 19, 2017 12:03 pm 
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Joined: Tue Oct 30, 2007 9:26 pm
Posts: 5661
Location: North Essex
Car Model: 900Ruby,vert, 9000, 99, Sonett
Sounds about right, although I thought that only the 21W filament lit in condition one.

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PostPosted: Fri May 19, 2017 12:15 pm 
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Joined: Mon Feb 07, 2005 4:48 pm
Posts: 21143
Location: Fliptop Towers, North Yorks...the flat bit.
Car Model: One or two...
That's what I thought, too, Andy. Although it's about 25 years since I last had a 99...

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PostPosted: Fri May 19, 2017 12:46 pm 
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Joined: Mon Oct 28, 2013 9:09 pm
Posts: 17
Location: Leicestershire
Car Model: 1981 Saab 99 Turbo (2dr)
Ok, thanks chaps.

You are probably right regarding condition 1 but I though I was getting power through both wires. However, it was getting late when I was checking last night and there is every chance that I was being outwitted by my multimeter. Could also be a quirk of using the 900 relay. Either way, don't suppose it matters much.


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PostPosted: Fri May 19, 2017 7:20 pm 
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Joined: Sat Jun 20, 2009 4:36 pm
Posts: 101
Car Model: 1978 99T 3 door, black
I'm a bit confused - in my 99T there is a specific CORNER LAMP switch

I also found I could fit the bulbs in "the wrong way around" - getting the 5W filament glowing when I was expecting the 21W

With the keyswitch OFF and the headlamp switch in position 1 (of 0/1/2) I get the parking lamps on (low power filament)

With the keyswitch ON (in the position where the engine will run) and the CORNER LAMP switch ON I get the Corner Lamps on (high power filament) irrespective of the headlamp switch position

I'm not sure what I get in other switch combinations and I never saw both filaments lit.

While I was tidying up the wiring I did get some strange behaviour with defective insulation meaning an unexpected earth connection coupled with a broken wire that has been poorly repaired - and getting the wrong lamp lit (very dim) - probably current going "the wrong way".


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PostPosted: Fri May 19, 2017 9:01 pm 
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Joined: Tue Oct 30, 2007 9:26 pm
Posts: 5661
Location: North Essex
Car Model: 900Ruby,vert, 9000, 99, Sonett
I could be wrong but I think that daytime "corner" lights were introduced around 1975 along with the larger sidelight fittings. Early cars had a (green) "Corner Light" switch. On later cars the switch was omitted and a fuse had to be removed if you didn't want to run with the corner lights illuminated.

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PostPosted: Fri May 19, 2017 9:50 pm 
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Put a SOC in it!
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Joined: Mon Feb 07, 2005 4:48 pm
Posts: 21143
Location: Fliptop Towers, North Yorks...the flat bit.
Car Model: One or two...
They arrived in 77. :geek:

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PostPosted: Sat May 20, 2017 10:04 am 
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Joined: Tue Oct 30, 2007 9:26 pm
Posts: 5661
Location: North Essex
Car Model: 900Ruby,vert, 9000, 99, Sonett
Fliptop wrote:
They arrived in 77. :geek:

I wasn't far out... :?

They weren't on my old '74 99 and they are on the current '77 99, so I knew it had to be somewhere in-between. :D

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